Business email footers

[jon-]

Those footers everyone seems to be putting in their emails, aka:

generic email footer said:

This message and any attachments ("the message") may contain confidential and/or privileged information for the intended recipient. If you are not the intended recipient, please contact the sender and delete all copies. Any use not in accordance with its purpose, any dissemination or disclosure, either whole or partial, is prohibited unless formal approval has been granted. The Firm XXXXXXXXXX declines any liability for any prejudice linked to any incident regarding security, integrity, virus or delay in transmission. Moreover, this message has no contractual or legal value whatsoever; in particular no business transaction can in any way be based exclusively on emails.

Do these actually have any legal weight, or is it just something everyone is now doing because everyone else is?

This post and any attachments ("the post") may contain confidential and/or privileged information for the intended recipient. If you are not the intended recipient, please avert your eyes from it's beauty and go and have a bath.